Description: The Ackermann function at 0 (for the first argument). This is the first equation of Péter's definition of the Ackermann function. (Contributed by AV, 4-May-2024)
Ref | Expression | ||
---|---|---|---|
Assertion | ackval0val |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ackval0 | ||
2 | 1 | a1i | |
3 | oveq1 | ||
4 | 3 | adantl | |
5 | id | ||
6 | peano2nn0 | ||
7 | 2 4 5 6 | fvmptd |